Cuprous oxide (Cu2O) has been intensively in the limelight as a promising photocathode material for photoelectrochemical (PEC) water splitting. The state-of-the-art Cu2O photocathode consists of a back contact layer for transporting the holes. an overlayer for accelerating charge separation. a protection layer for prohibiting the photocorrosion. https://jalyttlers.shop/product-category/rattles/